NYPD probes theory UnitedHealthcare CEO Brian Thompson was shot with a veterinary gun [Video]

Investigators believe the person who fatally shot UnitedHealthcare CEO Brian Thompson outside a Midtown Manhattan hotel earlier this week “could possibly be a disgruntled employee or a disgruntled client,” according to NYPD Chief of Detectives Joseph Kenny.

“This isn’t ‘Blue Bloods,’” Kenny said at a press conference on Friday, referring to a popular TV show starring Tom Selleck. “We’re not going to solve this in 60 minutes. We’re painstakingly going through every bit of evidence that we can come across.”

Kenny said the three words etched into rounds and shell casingsfound at the crime scene – “delay,” “deny,” and “depose” – suggested the shooter’s possible motive. They appear …